You've got the right idea, more space is always better. Just because its possible to raise them in a shoe box doesn't mean its good for them. All animals appreciate any extra room, even if they don't always use it.
Your enclosures will be great once done.
Back in the day, I kept herps too, sevaral Indian and Burmese, as well as monitors. I always provided room sized enclosures. They tend to be more active and healthier when they have the space to move around in. Also, more spectrum lighting is nice too. It keeps you from having to suppliment vitamins as much.
If I had one suggestion, it would be to scrap the use of wood shavings. They're suppose to be bad for animals, though I have never seen any issues first hand. But I could see how living your whole life sitting on the stuff could be a problem. I always used carpet grass. It looks great, is hygenic, and easy to keep clean. I would use pieces attached to rubber backings that held them in place and then you could easily remove a dirty piece to hose it off.